<?php

declare(strict_types=1);

namespace App\Framework\Waf\Feedback;

use App\Framework\Core\ValueObjects\Timestamp;
use App\Framework\Database\ConnectionInterface;
use App\Framework\Database\ValueObjects\SqlQuery;
use App\Framework\Waf\DetectionCategory;
use App\Framework\Waf\DetectionSeverity;
use PDO;

/**
 * Database implementation of the feedback repository
 */
final readonly class DatabaseFeedbackRepository implements FeedbackRepositoryInterface
{
    /**
     * @param PDO $pdo Database connection
     */
    public function __construct(
        private readonly ConnectionInterface $connection
    ) {
    }

    /**
     * {@inheritdoc}
     */
    public function saveFeedback(DetectionFeedback $feedback): void
    {
        $sql = '
            INSERT INTO waf_feedback (
                detection_id, feedback_type, user_id, comment,
                timestamp, category, severity, context
            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)
        ';

        $this->connection->execute(SqlQuery::create($sql, [
            $feedback->detectionId,
            $feedback->feedbackType->value,
            $feedback->userId,
            $feedback->comment,
            $feedback->timestamp->toSqlString(),
            $feedback->category->value,
            $feedback->severity->value,
            json_encode($feedback->context),
        ]));
    }

    /**
     * {@inheritdoc}
     */
    public function getFeedbackForDetection(string $detectionId): array
    {
        $sql = '
            SELECT
                detection_id, feedback_type, user_id, comment,
                timestamp, category, severity, context
            FROM waf_feedback
            WHERE detection_id = ?
            ORDER BY timestamp DESC
        ';

        $result = $this->connection->query(SqlQuery::create($sql, [$detectionId]));

        return $this->hydrateMultipleResults($result);
    }

    /**
     * {@inheritdoc}
     */
    public function getFeedbackByCategory(DetectionCategory $category, ?Timestamp $since = null): array
    {
        $sql = '
            SELECT
                detection_id, feedback_type, user_id, comment,
                timestamp, category, severity, context
            FROM waf_feedback
            WHERE category = ?
        ';

        $params = [$category->value];

        if ($since !== null) {
            $sql .= ' AND timestamp >= ?';
            $params[] = $since->toSqlString();
        }

        $sql .= ' ORDER BY timestamp DESC';

        $result = $this->connection->query(SqlQuery::create($sql, $params));

        return $this->hydrateMultipleResults($result);
    }

    /**
     * {@inheritdoc}
     */
    public function getFeedbackByFeedbackType(FeedbackType $feedbackType, ?Timestamp $since = null): array
    {
        $sql = '
            SELECT
                detection_id, feedback_type, user_id, comment,
                timestamp, category, severity, context
            FROM waf_feedback
            WHERE feedback_type = ?
        ';

        $params = [$feedbackType->value];

        if ($since !== null) {
            $sql .= ' AND timestamp >= ?';
            $params[] = $since->toSqlString();
        }

        $sql .= ' ORDER BY timestamp DESC';

        $result = $this->connection->query(SqlQuery::create($sql, $params));

        return $this->hydrateMultipleResults($result);
    }

    /**
     * {@inheritdoc}
     */
    public function getFeedbackStats(): array
    {
        // Get total count
        $totalResult = $this->connection->query(SqlQuery::create('SELECT COUNT(*) FROM waf_feedback'));
        $totalCount = (int)$totalResult->fetchColumn();

        // Get counts by feedback type
        $typeResult = $this->connection->query(SqlQuery::create('
            SELECT feedback_type, COUNT(*) as count
            FROM waf_feedback
            GROUP BY feedback_type
        '));
        $typeStats = [];
        foreach ($typeResult->fetchAll() as $row) {
            $typeStats[$row['feedback_type']] = (int)$row['count'];
        }

        // Get counts by category
        $categoryResult = $this->connection->query(SqlQuery::create('
            SELECT category, COUNT(*) as count
            FROM waf_feedback
            GROUP BY category
        '));
        $categoryStats = [];
        foreach ($categoryResult->fetchAll() as $row) {
            $categoryStats[$row['category']] = (int)$row['count'];
        }

        // Get counts by severity
        $severityResult = $this->connection->query(SqlQuery::create('
            SELECT severity, COUNT(*) as count
            FROM waf_feedback
            GROUP BY severity
        '));
        $severityStats = [];
        foreach ($severityResult->fetchAll() as $row) {
            $severityStats[$row['severity']] = (int)$row['count'];
        }

        // Get trend data (last 30 days)
        $trendResult = $this->connection->query(SqlQuery::create('
            SELECT
                DATE(timestamp) as date,
                feedback_type,
                COUNT(*) as count
            FROM waf_feedback
            WHERE timestamp >= DATE_SUB(NOW(), INTERVAL 30 DAY)
            GROUP BY DATE(timestamp), feedback_type
            ORDER BY date
        '));
        $trendData = [];
        foreach ($trendResult->fetchAll() as $row) {
            if (! isset($trendData[$row['date']])) {
                $trendData[$row['date']] = [];
            }
            $trendData[$row['date']][$row['feedback_type']] = (int)$row['count'];
        }

        return [
            'total_count' => $totalCount,
            'by_feedback_type' => $typeStats,
            'by_category' => $categoryStats,
            'by_severity' => $severityStats,
            'trend_data' => $trendData,
        ];
    }

    /**
     * {@inheritdoc}
     */
    public function getRecentFeedback(int $limit = 10): array
    {
        $sql = '
            SELECT
                detection_id, feedback_type, user_id, comment,
                timestamp, category, severity, context
            FROM waf_feedback
            ORDER BY timestamp DESC
            LIMIT ?
        ';

        $result = $this->connection->query(SqlQuery::create($sql, [$limit]));

        return $this->hydrateMultipleResults($result);
    }

    /**
     * Hydrates multiple DetectionFeedback objects from a PDO statement
     *
     * @param \PDOStatement $stmt The executed PDO statement
     * @return DetectionFeedback[] Array of DetectionFeedback objects
     */
    private function hydrateMultipleResults($result): array
    {
        $results = [];

        foreach ($result->fetchAll() as $row) {
            $results[] = $this->hydrateFromRow($row);
        }

        return $results;
    }

    /**
     * Hydrates a DetectionFeedback object from a database row
     *
     * @param array $row Database row
     * @return DetectionFeedback
     */
    private function hydrateFromRow(array $row): DetectionFeedback
    {
        return new DetectionFeedback(
            detectionId: $row['detection_id'],
            feedbackType: FeedbackType::from($row['feedback_type']),
            userId: $row['user_id'],
            comment: $row['comment'],
            timestamp: Timestamp::fromString($row['timestamp']),
            category: DetectionCategory::from($row['category']),
            severity: DetectionSeverity::from($row['severity']),
            context: json_decode($row['context'] ?? '{}', true) ?: []
        );
    }
}